WebUse await before both the hasNext () and next () method calls to ensure that you are operating on the correct return values as demonstrated in the following code: async function run () { ... const cursor = myColl. find (); while ( await cursor. hasNext ( )) { console. log ( await cursor. next ( )); } } ← Compound Operations Aggregation → WebThis module helps in implementing #2 - cursor based paging - by providing a method that make it easy to query within a Mongo collection. It also helps by returning a url-safe string that you can return with your HTTP response (see example below). Here are some examples of cursor-based APIs: Twitter Stripe Facebook Install
mongodb利用foreach查询和游标遍历（mongodb 遍历对 …
WebPerforms a find() query on a passed-in Mongo collection, using criteria you specify. The results are ordered by the paginatedField. @param {MongoCollection} collection A collection object returned from the MongoDB library's or the mongoist package's `db.collection()` method. Web2 jan. 2024 · 要迭代结果可使用游标的next ()，也可使用hasNext ()来查看是否有结果。 游标的迭代 var cursor = db.foo.find(); while(cursor.hasNext()){ //do stuff var next = cursor.next(); } 游标类实现了迭代器接口，可在 foreach 循环中使用。 游标中有一个迭代函数，允许自定义回调函数来逐个处理每个单元。 var cursor = db.foo.find(); … eli gold wife
Cursor: When Cursor is exhaust hasNext () function returns error ...
Web如果您懷疑您的數據可能跨越多個服務器（也稱為分片），則請與Dennis一起使用本機ObjectId。 如果您更喜歡int / long id（在URL上看起來更好），則可以按照Chris的建議，使用findAndModify從天真的實現生成器開始。 Webconst cursor = db.collection('myCollection').aggregate([ a pipeline that produce empty elements ]); const a = await cursor.hasNext(); const b = await cursor.hasNext(); Web10 apr. 2024 · (node:16012) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'high_' of null: at Long.equals (c:\Data\node\logio-promo-pricing\node_modules\mongodb ... foot \u0026 inch symbol